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3. Piping
3-1 Refrigerant pipe installation
□(1) The requirements for pipe diameter, pipe length, and lapse height between the indoor and outdoor units are
shown in the table below.
System example:
The diagram shows one outdoor unit with four indoor
units.
In this example, only one refrigerant pipe is used. In
actual installation, however, separate pipes should be
used for refrigerant and refrigeration oil.
Outdoor unit model
Total pipe length: L0 + L1+ L2
Max. pipe length (actual): Lt
Max. lapse height between the
outdoor unit and indoor units:
H1
Max. lapse height between indoor units: H2
Max. pipe length between branch pipes and indoor units:
L1, L2
Branch pipe selection
Cautions
(2) Refrigerant pipe size
●Indoor unit
Capacity Level
112, 125, 140,160
Pipe length from the outdoor
unit to each indoor unit.
When the outdoor unit is
higher than the indoor units.
When the outdoor unit is
lower than the indoor units.
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
Φ6.35
Φ15.88
Φ9.53
RAM-112FPSQB
70
90(70)
30
20
3
10
MW-NP282A at a
1. The length and route of both the refrigerant and
refrigeration oil pipes must be the same.
2. Branch pipes should be near the indoor unit.
●Outdoor unit
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
Φ15.88
Φ9.53
8
RAM-125/140/160FPSQB
75
95(75)
30
20
3
10
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